Switch gear for starting and controlling electric motors



Aug. '14. 1928. 1,680,682

J. A. HIRST SWITCH GEAR FOR STARTING AND CONTROLLING ELECTRIC lOTORS Original Filed July is, 1924 19 sheets-sheen Aug. 14. 1928. 1,680,682

, J. A. HIRST swncn GEAR FOR smmrme AND conmonune ELECTRIC logons original Filed July 18, 1924 19 Sheets-$11901: 2

v 1A7 x j 4. 776/4. 2 r 2 11m Fin Aug. 14.1928. 1,680,682

J. A. HIRST SWITCH GEAR FOR STARTING AND CONTROLLING ELECTRIC IOTORS Original Filed July 18, 1924 19 sheets shgei 3' Aug. 14. 1928.

A. HIRST SWITCH GEAR FOR STARTING AND CONTROLLING ELECTRIb IOTORS Original Filed July 18, 1924 19 Sheets-Sheet 4 Aug. 14. 1928.

J. A. HIRST SWITCH GEAR FOR'STARTING AND CONTROLLING ELECTRIC MOTORS Sheets-Sheet 5 Original Filed July 18, 1924 jrrr/prr o Aug. 14. 1928. 1,680;682

J. A. HIRST SWITCH GEAR FOR STARTING AND CONTROLLING ELECTRIC MOTORS Original Filed July 18, 1924 19 Sheets-Sheet 6 Aug; 14. 1928. 1,680,682-

- J. A. HIRST SWITCH GEAR FOR STARTING AND CONTROLLING ELECTRIC MOTbRS OriinaIFi led July 18, 1924 4 19 Sheets-Sheet 7 Aug. 14, 1928.

J. A. HIRST SWITCH GEAR FOR STARTING AND CONTROLLING ELECTRIC uo'roxs l9 Sheets-Sh nt 8 W5 /2 Original Filgd July 18, 1924 LEE- Aug. 14. 1928. 1,680,682

J. A. HlRST SWITCH GEAR FOR STARTING AND CONTROLLING ELECTRIC MOTORS Original Filed July 18, 1924 19 Sheets-Sheet'Q Aug. 14. 1928.

J. A.'HIRST SWITCH GEAR FOR STARTING AND CONTROLLING ELECTRIC uo'rons Original Fild July 18, 1924 19 Sheets-Sheet l0 IV Ill/l lI/l/I J. A. HIRST S WlTCI-I GEAR FOR STARTING AND CONTROLLING ELECTRIC MOTORS Original Filed J u1y 18, 1924 1.9 Sheets-Sheet. 11

Aug. 14. 1928.

J. A. HIRST I SWITCH GEAR FOR STARTING AND CONTROLLING ELECTRI C MOTORS Filed July 18, 1924 19 Sheets-Sheet 12 &

Aug. 14. 1928? 1,680,682

J. A. HIRST SWITCH GEAR FOR STARTING AND CONTROLLING ELECTRIC MOTORS Original Filed July l8, 1924 19 Sheets-Sheet 15 f/dZZJ'. v f/a 2m Aug. 14, 1928. 1,680,682

. J. A. HIRST SWITCH GEAR FOR STARTING AND CONTROLLING ELECTRIC IOTORS Original Filed July 18, 1924 19 Sheets-Sheet 14 J! 5 E fiv 1.680.682 J. A. HIRST swI'rcH GEAR FOR STARTING AND CONTROLLING ELECTRIC uo'ToRs l9 Sheets-Sheet 15 Aug. 14. 1928.

ori inai Fil ed July 18, 1924 Aug. 14. '1928. 1,680,682

J. A. HIRST SWITCH GEAR FOR STARTING AND CONTROLLING ELECTRIC IOTORS Original Filed July-l8, 1924 19 Sheets-Sheet 1";

Aug. 14. 1928.

J. A. HlRs'r SWITCH GEARFOR STARTING AND CONTROLLING ELECTRIC ia'fons :19 sneets-snet 17 Original Filed July 18, 1924 /7fiJ/.

AugQl4, 1928. v1,680,682

J. A. HlRST SWITCH GEAR FOR STARTING AND CONTROLRIING ELECTRIC MOTORS Original Filed July 18, 1924 19 Sheets-Sheet 1B jl%n hldwwwmg %w Aug. 14, 1928. I 1,680,682

J. A. HIRST SWITCH GEAR FOR STARTING AND CONTROLLING ELECTRIC IOTORS Original Filed July 18, 1924 19 Sheets-Sheet 19 flaws.

j v e 71 Patented Aug. 14, 1928;

UNI ED stares JOHN ARTHUR FIRST, OF CH ESTERQENGLAND.

swrrcn GEAR FOR srirnrri zennn.cenrnonnrne ELECTRIC Morons.

Application filed fuly ltl, 1924, Serial No. 726,845, and in Great Britain iuly 24,1923; Renewed liune ftl,

capable of independent spring-controlled movement and being adapted to be moved together in opposition to their respective springs by a common handle gear mechanism from. their-initial position'to a position in which one or both of them connect respective sets offixed contacts, and in'which position one of them is retained by a detent, with or without novolt or overload-control devices, theother when the handle is released heingreturned by its spring to its initial position in which it makes connections with its i 'xedcontacts which complete the full;

on connections ofthe gear.

Preferably the moving contacts are 'ar ranged in drum form andwill be referred to herein as drums, though any equivalent of the drum construction may be adopted; the moving contacts on the drum which, when the handle is released, returned, to its initial positioinare einployedin a motor starter as a connection changing switch, the moving contacts on the other drum being employed .to make and break the circuit connections and will be referred to as the circuit breaker pm. W m Beth drums arepreterably adapted to be retained in the position into whicl'i 'they are.

moved by the handle gear by respective deten s, the detent o'ttheone (saythe coniiectic-n changing switch) being released by the inoven'ient of the handle'to its initial posi .tion or by the return movement of an independent partti rom position. into which it is moved by the handle gear,. the said movement being, it requiren, delayed by a time limit device; the detent of the other part (the circuit breaker) being adapted to be released by a no-volt, or an overload device, or by a pressbutton.

When used as a star delta motor starter,

the connection changing switch makes the delta connections in its initial position, but as the circuit breaker does not in this position connect the circuit, the said connections are, not operative. When'th e' two parts are moved into theposition in which they-are retained by their detents the connection changing switch makesjthe star connection and ihGClIC'Llli) breaker connects tothe supply mains.

On releasing the handle tl1e=connecti0n changing drum returnsto itsinitial position andnnakes the delta connections, thus completing therunnlng connectlons or the motor, the said movement of the connection changing switch being retarded ii necessary by the employment of an independent releasing part controlled by altime' limitdevl 1 Then the gear is used 1 preferably fit auxiliary fuses-in. addition tothe main fuses in the circuit, the latter being connected so as to b permanently in the circuit and the formerbeing. connected inparallel with the latter-when the switchgear is in the starting position.

The handle by which the gear is operated be connected tothe armature oi a magnet energized by the main current, which armature prevents thelreturn of the handle to its initial position untilthe main'currcnt has fallen'be low apredetermined value.

fi lhegearis also adapted to be operated by a press button, in which case alever, on the actuatingshaft is connected to the armature of ainagnet having'opposing series and as a motor starter, V

shunt windingsfthe arrangement being such i that on closing the shunt winding-shy means of" the press button switch the drums are moved into the position in which they are retained by their detents, the return moveinent'ofithe shaft which 'efi'eotsthe ,relea, of the detent of the connection changing drum being delayed until the current in the series winding fallsto a predetermined value.

Vi hen the gearis used as a circuit breaker, 

